1/**
 2* @desc First-order Bessel
 3* @param {number} t Current percentage
 4* @param {Array} p1 Starting coordinates
 5* @param {Array} p2 Terminal coordinates
 6*/
 7oneBezier(t, p1, p2) {
 8    const [x1, y1] = p1;
 9    const [x2, y2] = p2;
10    let x = x1 + (x2 - x1) * t;
11    let y = y1 + (y2 - y1) * t;
12    return [x, y];
13}
14
15/**
16* @desc Second-order Bessel
17* @param {number} t Current percentage
18* @param {Array} p1 Starting coordinates
19* @param {Array} p2 Terminal coordinates
20* @param {Array} cp control point
21*/
22twoBezier(t, p1, cp, p2) {
23    const [x1, y1] = p1;
24    const [cx, cy] = cp;
25    const [x2, y2] = p2;
26    let x = (1 - t) * (1 - t) * x1 + 2 * t * (1 - t) * cx + t * t * x2;
27    let y = (1 - t) * (1 - t) * y1 + 2 * t * (1 - t) * cy + t * t * y2;
28    return [x, y];
29}
30
31/**
32* @desc Third-order Bessel
33* @param {number} t Current percentage
34* @param {Array} p1 Starting coordinates
35* @param {Array} p2 Terminal coordinates
36* @param {Array} cp1 Control point 1
37* @param {Array} cp2 Control point 2
38*/
39threeBezier(t, p1, cp1, cp2, p2) {
40    const [x1, y1] = p1;
41    const [x2, y2] = p2;
42    const [cx1, cy1] = cp1;
43    const [cx2, cy2] = cp2;
44    let x =
45        x1 * (1 - t) * (1 - t) * (1 - t) +
46        3 * cx1 * t * (1 - t) * (1 - t) +
47        3 * cx2 * t * t * (1 - t) +
48        x2 * t * t * t;
49    let y =
50        y1 * (1 - t) * (1 - t) * (1 - t) +
51        3 * cy1 * t * (1 - t) * (1 - t) +
52        3 * cy2 * t * t * (1 - t) +
53        y2 * t * t * t;
54    return [x, y];
55}